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good luck with your surveys.
I will try to help with the ID but bear in mind that it is difficult sometimes based on photos alone.
It is far easier when they are in the hand!

1 White-tailed bb (correct)
2 Red-tailed bb (correct)
3 This is not an Early bb. But difficult to ID. Looks like one of the cuckoo bumblebees. You might have to mark as unknown spp.
4 Unsure- this is definitely a cuckoo bumblebee probably a Forest or a Gypsy cuckoo- but I would need to see more angles to be sure. Might have to mark as unknown cuckoo spp.
5 This is an Early bumblebee worker and not a buff-tailed bb.
6 Buff-tailed queen (correct)
7 Common carder (correct) probably a queen, judging by the size.

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I think the extra photo of the tail is very helpful.
Forest cuckoo females tend to have a white tail apart from the last segment bearing the sting. They tend to curl this segment under their body which tends to be indicative of this species. If you feel that was notable in this bee then go ahead and mark it as female Forest cuckoo Bombus sylvestris.